From f72238fc65686bf1564515fcde4717bfc68da12f Mon Sep 17 00:00:00 2001
From: Gustavo Shigueo <gustavo.gsmn@gmail.com>
Date: Sun, 10 Nov 2024 23:04:25 -0300
Subject: [PATCH] Validate `optional_fields` compatibility with other
 attributes

---
 macros/src/attr/struct.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/macros/src/attr/struct.rs b/macros/src/attr/struct.rs
index 2244f808..80d1e12f 100644
--- a/macros/src/attr/struct.rs
+++ b/macros/src/attr/struct.rs
@@ -108,6 +108,10 @@ impl Attr for StructAttr {
             if self.tag.is_some() {
                 syn_err!("`tag` is not compatible with `type`");
             }
+
+            if let Optional::Optional { .. } = self.optional_fields {
+                syn_err!("`optional_fields` is not compatible with `type`");
+            }
         }
 
         if self.type_as.is_some() {
@@ -118,6 +122,10 @@ impl Attr for StructAttr {
             if self.rename_all.is_some() {
                 syn_err!("`rename_all` is not compatible with `as`");
             }
+
+            if let Optional::Optional { .. } = self.optional_fields {
+                syn_err!("`optional_fields` is not compatible with `as`");
+            }
         }
 
         if !matches!(item, Fields::Named(_)) {
@@ -128,6 +136,10 @@ impl Attr for StructAttr {
             if self.rename_all.is_some() {
                 syn_err!("`rename_all` cannot be used with unit or tuple structs");
             }
+
+            if let Optional::Optional { .. } = self.optional_fields {
+                syn_err!("`optional_fields` cannot be used with unit or tuple structs");
+            }
         }
 
         Ok(())